Ask A Scientist© Weather Archive

> >>   name        Lisa
> >>   status      student
> >>   age         20s
>
> >>   Question -  Whaty is Fog Lift?
> >>
> >>context - when walking through a swamp the area is foggy,
> >>later in the day when the sun is higher the fog has "lifted"
> >>What really happened?
> >
>
>Lisa,
>
>Fog doesn't really lift.  As the sun warms the surface
>the warmed ground warms the air, raising the air temperature
>above the temperature at which water vapor condenses into a
>cloud (fog is just a cloud near the Earth's surface).  The sun
>can penetrate the early morning fog enough to warm the surface
>and create the appearance that the fog is lifting.
>
>David Cook
>Argonne National Laboratory


=========================================================